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"""Tests for the structured open-frame stack surfaced by CannotCallSubexpressionError."""
import pytest
from edify import RegexBuilder
from edify.errors.quantifier import DanglingQuantifierError
from edify.errors.structure import CannotCallSubexpressionError
def test_single_open_capture_frame_is_named_in_the_error_message():
unfinished = RegexBuilder().capture().digit()
with pytest.raises(CannotCallSubexpressionError) as excinfo:
unfinished.to_regex_string()
text = str(excinfo.value)
assert "1 open frame" in text
assert "1. .capture()" in text
def test_nested_open_frames_are_listed_innermost_first():
unfinished = RegexBuilder().capture().group().assert_ahead().digit()
with pytest.raises(CannotCallSubexpressionError) as excinfo:
unfinished.to_regex_string()
text = str(excinfo.value)
assert "3 open frame" in text
innermost_index = text.index("1. .assert_ahead()")
middle_index = text.index("2. .group()")
outermost_index = text.index("3. .capture()")
assert innermost_index < middle_index < outermost_index
def test_named_capture_frame_reports_the_declared_group_name():
unfinished = RegexBuilder().named_capture("username").letter()
with pytest.raises(CannotCallSubexpressionError) as excinfo:
unfinished.to_regex_string()
text = str(excinfo.value)
assert '.named_capture("username")' in text
def test_open_frames_carry_a_file_line_column_pointer_when_the_context_is_captured():
unfinished = RegexBuilder().assert_behind().digit()
with pytest.raises(CannotCallSubexpressionError) as excinfo:
unfinished.to_regex_string()
text = str(excinfo.value)
assert "opened at" in text
assert __file__ in text or "frames.test.py" in text
def test_subexpression_lists_open_frames_from_the_argument_not_the_receiver():
unfinished = RegexBuilder().named_capture("group").digit()
parent = RegexBuilder()
with pytest.raises(CannotCallSubexpressionError) as excinfo:
parent.subexpression(unfinished)
assert 'named_capture("group")' in str(excinfo.value)
def test_dangling_quantifier_reports_the_specific_pending_quantifier_name():
with pytest.raises(DanglingQuantifierError) as excinfo:
RegexBuilder().exactly(3).to_regex_string()
text = str(excinfo.value)
assert ".exactly(3)" in text
def test_dangling_quantifier_falls_back_to_generic_summary_when_name_unknown():
error = DanglingQuantifierError()
text = str(error)
assert "dangling quantifier" in text
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